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Finding the Fourth Proportional to 982.90, 1,356.41 and 540.80

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Solution

The fourth proportional to 982.90, 1,356.41 and 540.80 is: 746.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.90 : 1,356.41 = 540.80 : x
  2. Step 2: Convert to fraction form
    982.90/1,356.41 = 540.80/x
  3. Step 3: Cross multiply
    982.90x = 1,356.41 × 540.80
  4. Step 4: Simplify right side
    982.90x = 733,553.81
  5. Step 5: Solve for x
    x = 733,553.81/982.90
  6. Step 6: Final answer
    x = 746.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.